You're not. Despite its impressive pedigree and unshakable assurance, "Knight and Day" is nothing more or less than an average popcorn flick. That's not to say you won't have a decent time, just that you'll have forgotten it by the next morning.

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After meeting cute at the airport, June (Diaz) and Roy (Cruise) board the same plane to Wichita. Minutes later, he's killed every other passenger, before landing the aircraft himself. As she stares in horror, he calmly explains he's safeguarding the world's most powerful energy source -- a battery created by Paul Dano's shy geek.

Unfortunately, since June now knows about it, various villains (including Peter Sarsgaard) keep trying to kidnap or kill her. Her only hope, Roy insists, is in sticking by his side.

Cruise is in overdrive here, working like crazy to entertain us (and perhaps prove, at 48, what a reliable action hero he is). And Diaz uses all her resources finding new ways to shriek and be saved. ("Killers"' Katherine Heigl, who thoroughly botched the same thankless assignment, should take notes.)

So there's little energy left for sparks between the two, especially since Mangold is focused on moving things briskly enough to distract from the gaping plot holes. Whenever it's impossible to get out of a jam, for example, he and O'Neill simply shift to the next scene, and with so much confidence you may not even notice their deception.

A sheen of professionalism clings to every element, from the international chases to the stars' performances. But look just beyond the slick gloss, and you'll share June's dawning realization: things aren't exactly as they seem. Roy, she believes, is even more special than he appears. His movie, unfortunately, can't claim the same.